Spa



FIG. 1 is a front perspective view of the spa of the invention;

FIG. 2 is a left side perspective view of the spa illustrated in FIG. 1;

FIG. 3 is a top plan view of the spa illustrated in FIG. 1;

FIG. 4 is a front elevation view of the spa illustrated in FIG. 1;

FIG. 5 is a left and right elevation view of the spa illustrated in FIG. 1; and,

FIG. 6 is a rear elevation view of the spa illustrated in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a spa, as shown and described. 